I'm curious - has anyone done any, erm, research into how they're able to get away with all these?
says, it's protected speech as long as it's presented as a parody. It's no different, legally, from Saturday Night Live
doing a sketch about Superman or Star Trek
-- they're using the actual copyrighted names, but in the context of something that's clearly a parody, so they're not trying to compete directly with the original by passing their work off as the real thing.